id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
4837	referencing subexpr matches via names asserts	nis.aggarwal@…	John Maddock	"I am using named subexpressions. The regex pattern constructs fine and the matching works fine too but when I try to index into the match_results object using the name, an assertion is thrown. 

{{{
#include <boost/regex.hpp> 
#include <string> 
#include <iostream> 
#include <stdio.h>

using namespace boost; 

int main()
{
    std::string str = ""for is while"";

    regex pat(""(?<keyword>\\b(for|while)\\b)"");
    sregex_iterator match_iter(str.begin(), str.end(), pat);
    sregex_iterator match_end;

    for (; match_iter != match_end; ++match_iter) {
        smatch match = (*match_iter);

        ssub_match keywordMatch = match[""keyword""];
        if (keywordMatch.matched) {
            printf(""matched a keyword!\n"");
        }
        size_t pos = (*match_iter).position((size_t)0);
        size_t len = (*match_iter)[0].second - (*match_iter)[0].first;
        
        std::cout << pos << "","" << len << std::endl;
    }

    return 0;
}
}}}
"	Bugs	closed	To Be Determined	regex	Boost 1.40.0	Showstopper	worksforme	regex named subexpression